求助XDF problem solving 一题

cyang16

(a/b)/c

In the expression above , a, b, and c are different numbers and each is one of the numbers 2,3,or 5. What is the least possible value of the expression?

(A)1/30

(B)2/15

(C)1/6

(D)3/10

(E)5/6

答案是B，可我认为B,D,E概率都一样啊？怎么理解题目最后的问题呢？

cyang16

谢谢LS指点！！